Create a common WebView that should be used when the main WPCOM authentication is necessary to load the desired URL
2nd pass at making a generic WPCOM Authenticated WebView
Remove LOAD_NO_CACHE from webView settings since it is not needed.
Skip using getResources() and use getText() where possible
Do not set the User-Agent HTTP header to wp-android/X.X.X which can cause problems with browser sniffing plugins
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into issue/1751-AuthenticatedWebView-no-blog
Merge AuthenticatedWebViewActivity and DotComAuthenticatedWebViewActivity in one single activity. Fix for #1876
Merge pull request #1868 from wordpress-mobile/issue/1751-AuthenticatedWebView-no-blog

New WPCOM Authenticated webView